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3z-4y=2z - 4.5 8y =2z +5

Consider the system of equations. If (y, z) is the solution to the system, then what is the value of y- -z?

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y - z = 8y - 2z = 5

what gibberish.
what is that extra - 4.5 doing there?
what does y- -z mean?

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